Small Hybrid Rocket Engines Fabricated via X-Ray Lithography

Small hybrid rocket engines of a proposed type would burn specially shaped hollow cylinders of solid fuel containing slanted oxygen-injection channels, as shown in the figure. These engines would exploit a vortex flow phenomenon associated with the radial inflow of the oxygen in the channels. The fuel/flow-channeler cylinders could be supplied in or as cartridges that could fit into reusable receptacles.